Search found 10829 matches

by hoglet
Tue Jan 18, 2022 7:12 pm
Forum: other vintage hardware, software and languages
Topic: ZX Spectrum next... Anybody backing ?
Replies: 215
Views: 37476

Re: ZX Spectrum next... Anybody backing ?

Porting to Artix-7 should be fairly straight forward as there is already a version of BeebFPGA for a board using a Xilinx 7-series part (the PYNQ Z2 board using the ZYNQ). This uses the Vivado tool chain. So there aren't any fundamental incompatibilities. The problem, though, is my lack of motivatio...
by hoglet
Mon Jan 17, 2022 3:10 pm
Forum: 8-bit acorn hardware
Topic: ADFS E00 for all . . . . ! . . . ?
Replies: 18
Views: 533

Re: ADFS E00 for all . . . . ! . . . ?

I did look at Hoglet's ADFS 130 disassembly/source but it isn't fully documented. I found a few places where it looked like indirect addressing via ZP pointers with those pointers being set by magic constants & stopped. I don't think it would be very hard to fix up, I just stopped. I think I ca...
by hoglet
Sun Jan 16, 2022 3:17 pm
Forum: 8-bit acorn hardware
Topic: So, I bought a job lot - Master no.1 - Not a language
Replies: 60
Views: 1025

Re: So, I bought a job lot - Master no.1 - Not a language

Colday wrote:
Sun Jan 16, 2022 3:08 pm
Acorn ADFS

But then didn't get me to a prompt.
That bit is normal, it's ADFS trying to mount a non-existent disk - avoidable with the *CONFIG NODIR option.

Does Ctrl-D-BREAK get you to a prompt?

(Hold Ctrl and D down, then press and release break)

Dave
by hoglet
Sun Jan 16, 2022 12:06 pm
Forum: 8-bit acorn software: other
Topic: Manipulating ADFS images from command line
Replies: 13
Views: 192

Re: Manipulating ADFS images from command line

For AcornFsUtils, it looks like the most recent commit was missing some files. I'm sure Steve will fix this shortly. Assuming you don't need ide2scsi and scsi2ide, if you go back a commit you won't get this error: git checkout 2e15f31dd If I recall, the biggest limitation with these tools is I don't...
by hoglet
Sat Jan 15, 2022 2:40 pm
Forum: 8-bit acorn software: other
Topic: PunyInform and Ozmoo
Replies: 886
Views: 59350

Re: PunyInform and Ozmoo

I think someone else has developed another tool that is primarily command line, but I couldn't find it on a quick search. Or maybe you already have an appropriate tool, given that you can already generate the .ssd & .adf /.adl files? Was it Steve Fosdick? (Coeus) https://github.com/SteveFosdick...
by hoglet
Fri Jan 14, 2022 8:28 pm
Forum: acorn atom and acorn system series
Topic: Ghost characters on Atom video
Replies: 14
Views: 438

Re: Ghost characters on Atom video

I don't think the way to resolve this is by capacitively loading the Y signal; that will affect the video quality significantly

It's better to add capacitive load to the DA4 signal (pin 26), or add an inline resistor close to the 6847.

Dave
by hoglet
Fri Jan 14, 2022 9:14 am
Forum: acorn atom and acorn system series
Topic: Ghost characters on Atom video
Replies: 14
Views: 438

Re: Ghost characters on Atom video

I long time ago, in a place far away, I investigated this line artifact: https://stardot.org.uk/forums/viewtopic.php?p=57310#p57310 I concluded it was crosstalk from pin 26 of the 6847 (DA4) to pin 28 of the 6847 (Y). The Y signal is very prone to crosstalk because it's there is such a low voltage d...
by hoglet
Wed Jan 12, 2022 7:30 am
Forum: 8-bit acorn hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)
Replies: 1562
Views: 244199

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)

I've just noticed that issue #130 (ADFS directories having the last line overwritten) is not solved in rc2, in certain cases -- I've added a comment to the issue but it's closed and I don't know if you get a message telling you that (I don't think I can reopen it, since you created it on my behalf)...
by hoglet
Tue Jan 11, 2022 5:06 pm
Forum: 8-bit acorn hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)
Replies: 1562
Views: 244199

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)

Hello all,

Just a quick note to say there is a second (and hopefully final) release candidade for the PiTubeDirect Hognose available here:
https://github.com/hoglet67/PiTubeDirec ... ognose-rc2

Click on the above link for the full list of changed since the last release candidate.

Dave
by hoglet
Sun Jan 09, 2022 4:36 pm
Forum: 8-bit acorn hardware
Topic: BBC Micro Issue 3 - couple of issues
Replies: 34
Views: 873

Re: BBC Micro Issue 3 - couple of issues

Dave - IC4 is socketed on the Issue 3 board but unfortunately not on the working Beeb so I can't swap them. I'd be reluctant to try desoldering any ICs on the working board as it's likely to end badly knowing my luck. I'm assuming one of these isn't likely to be a couple of quid just to see if it w...
by hoglet
Sun Jan 09, 2022 3:15 pm
Forum: 8-bit acorn hardware
Topic: BBC Micro Issue 3 - couple of issues
Replies: 34
Views: 873

Re: BBC Micro Issue 3 - couple of issues

In my case the issue was the 6850 (IC4) not the Serial ULA (IC7).

If that is socketed, it's worth swapping as well.

Dave
by hoglet
Sun Jan 09, 2022 1:35 pm
Forum: 8-bit acorn hardware
Topic: BBC Micro Issue 3 - couple of issues
Replies: 34
Views: 873

Re: BBC Micro Issue 3 - couple of issues

1. No sound from speaker, either on bootup or doing various checks I found elsewhere. I have a known working beeb and have tried the speaker from that with the same results. Seems to emit a very low static while powered on but no actual sound. Other posts suggest checking the -5V which is fine. I'v...
by hoglet
Sun Jan 09, 2022 10:32 am
Forum: 8-bit acorn software: other
Topic: MMFSv2 question
Replies: 20
Views: 511

Re: MMFSv2 question

msknight wrote:
Sun Jan 09, 2022 10:20 am
When I started unpacking and trying the MMFS 1.50 roms, I tried the v2 system but found it didn't work. I think it asked for the Card?
Card? can mean you picked the wrong ROM image for you hardware

You need MMFSv2/T/MMFS.rom

Dave
by hoglet
Sat Jan 08, 2022 11:32 pm
Forum: 8-bit acorn hardware
Topic: Pins for logic reading CPU
Replies: 8
Views: 252

Re: Pins for logic reading CPU

Some background, in case anyone has lost the plot... - This thread is really a continuation of an eariler thread CY7C68013A software and probes which relates to an even earlier mega thread Open Source Logic Analyzer Experiments - The logic analyzer connections being discussed are the default assigne...
by hoglet
Sat Jan 08, 2022 9:16 pm
Forum: 8-bit acorn hardware
Topic: Pins for logic reading CPU
Replies: 8
Views: 252

Re: Pins for logic reading CPU

In addition, connect:
- SYNC (pin 7) to PD1
- PHI (pin 37) to PD7

You don't need to connect IRQ or NMI.

So you should end up with:
- D0..7 (pin 33 to 26) to PB0..PB7
- RnW (pin 34) to PD0
- SYNC (pin 7) to PD1
- nRST (pin 40) to PD6
- PHI (pin 37) to PD7
- GND (pin 1 or 21) to GND

Dave
by hoglet
Sat Jan 08, 2022 3:10 pm
Forum: miscellaneous new bbc and electron games
Topic: DOOM - ARM7TDMI version
Replies: 6
Views: 682

Re: DOOM - ARM7TDMI version

It's been a while since I updated this, before christmas I was working on adding PiTubeDirect framebuffer support to my ports, DOOM was one of the first I got working, this version adds support for 320x200 256 colour mode via the PiTubeDirect's own framebuffer I just checked this out on the latest ...
by hoglet
Fri Jan 07, 2022 6:53 pm
Forum: 8-bit acorn software: other
Topic: 65C102 Tube ROM
Replies: 10
Views: 315

Re: 65C102 Tube ROM

I thought the 1.20 version of the 6502 Tube ROM was actually unreleased:
https://github.com/stardot/Acorn6502Tub ... README.txt

But then, I wrote that README, so I'm not sure that counts as independant evidence.
by hoglet
Fri Jan 07, 2022 3:47 pm
Forum: 8-bit acorn hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)
Replies: 1562
Views: 244199

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)

I haven't noticed any correlation with screen mode but I'm pretty much always in MODE 7, certainly during my test program and BigEd's. I could try other modes but they were less reliable than MODE 7, before. Do you want me to try it in other modes to see if it makes it more or less crashy? Yes, tha...
by hoglet
Fri Jan 07, 2022 1:58 pm
Forum: 8-bit acorn hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)
Replies: 1562
Views: 244199

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)

Here's a thought: not only is Hognose a new codebase, but also it has been built with a newer toolchain. I wonder, if Gecko were built with the newer toolchain, would it show the same symptoms? (Or, if possible, if Hognose were built with the older toolchain, but it mightn't be possible.) My gut fe...
by hoglet
Fri Jan 07, 2022 1:52 pm
Forum: 8-bit acorn software: other
Topic: Which ROMS?
Replies: 30
Views: 797

Re: Which ROMS?

Thanks for the heads up. I need to read up because there are various directories E M P T and U, and I'm not sure which I should be using. Both the MMFS and MMFS2 in the U directory didn't work, so I've got to do more reading on the web site as to which I should be using. You need the version in the...
by hoglet
Thu Jan 06, 2022 2:01 pm
Forum: 8-bit acorn hardware
Topic: Pi CoPro, Second Screen, VDU Driver, BBC BASIC Demo
Replies: 17
Views: 752

Re: Pi CoPro, Second Screen, VDU Driver, BBC BASIC Demo

Is the Pi co-pro able to access the frame buffer directly? As crazy as it sounds, just wondered whether running a Beeb emulator on the Pi co-pro would be an option? Yes, the Native ARM Co Pro can access it directly. The base address is held in one of the VDU variables and is readable. See the examp...
by hoglet
Thu Jan 06, 2022 8:48 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 2021
Views: 226200

Re: RGB to HDMI using a Pi Zero and a small CPLD

I thought that would likely be the case! Oh well, out with the iron again :-) You can usually locate a single faulty pin just by gently pressing down on each pin in turn with a fine plastic prodder (with the system running). Applying just a tiny amount of pressure is normally sufficient to cause th...
by hoglet
Wed Jan 05, 2022 9:47 pm
Forum: acorn atom and acorn system series
Topic: Sick Atom
Replies: 46
Views: 836

Re: Sick Atom

Unfortunately, removing the CPLD has proved that the CPLD is toast. And I'm not sure I have a programmer for a replacement :( One last test will confirm this beyond doubt: measure the 3.3V rail under load. The regulator is a 100mA regulator, so I would test it at half it's rated current: 50mA. To d...
by hoglet
Wed Jan 05, 2022 8:40 pm
Forum: acorn atom and acorn system series
Topic: Sick Atom
Replies: 46
Views: 836

Re: Sick Atom

Edit: confirmed and also checked across the electrolytic (C13). So, the regulator has given up. I'll order one and see if that fixes it It could also be that: - the CPLD has died, and is effectively shorting out the 3.3V supply. - the electrolytic capacitor has gone short circuit/ If you are carefu...
by hoglet
Wed Jan 05, 2022 7:41 pm
Forum: acorn atom and acorn system series
Topic: Sick Atom
Replies: 46
Views: 836

Re: Sick Atom

The ROM is fine, the Atom Kernel parts are identical to my ROM.

Can you measure the output voltage of the 3.3V regulator on the Ram Rom board (the 3-pin TO92 device)?

Dave
by hoglet
Wed Jan 05, 2022 5:08 pm
Forum: 8-bit acorn hardware
Topic: MMFS Development and Support
Replies: 1075
Views: 141118

Re: MMFS Development and Support

Am I right in thinking that the desired behavour is that Shift/BREAK and *DBOOT <disk number/name> should both:
- reset the current directory to $
- reset the current drive to 0

I think this would match what the Master does.

It does neither at present.

Dave
by hoglet
Wed Jan 05, 2022 4:59 pm
Forum: 8-bit acorn software: other
Topic: PunyInform and Ozmoo
Replies: 886
Views: 59350

Re: PunyInform and Ozmoo

SteveF wrote:
Wed Jan 05, 2022 4:18 pm
Thanks for reporting that Ken, I'll be interested to see what Dave comes up with. I had a quick look at the commit he mentioned but rapidly backed away when I saw it mentioned "Bad sum" . :-)
Yes, I did the same....
by hoglet
Wed Jan 05, 2022 12:43 pm
Forum: off-topic
Topic: Oscilloscope training thingy
Replies: 5
Views: 371

Re: Oscilloscope training thingy

thecellartroll wrote:
Wed Jan 05, 2022 12:12 pm
It is a HP 54645D 100Mhz 2+16 channels.
A most excellent scope!

I have it's successor, the HP 54622D.
by hoglet
Wed Jan 05, 2022 7:52 am
Forum: 8-bit acorn hardware
Topic: MMFS Development and Support
Replies: 1075
Views: 141118

Re: MMFS Development and Support

Here's a link back to earlier in this thread (18th June 2016) when this particular change was discussed: https://stardot.org.uk/forums/viewtopic.php?p=140999#p140999 I'll need to re-read the preceeding posts and try to understand again exactly what this Bad Sum issue was.... Ken - do you know if the...
by hoglet
Wed Jan 05, 2022 7:45 am
Forum: 8-bit acorn hardware
Topic: Pi CoPro, Second Screen, VDU Driver, BBC BASIC Demo
Replies: 17
Views: 752

Re: Pi CoPro, Second Screen, VDU Driver, BBC BASIC Demo

Sure, happy to give this a go. Is it just a matter of pulling the sd card and updating an applicable folder with the files? I assume I will need to pay attention to the contents of my current config file as well right? Sorry for the basic question btw. Did you install the beta1 release of Hignose y...

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